Nanomaterials
·
2021
·Vol. 11
·期 8
·2004
·
IF 5.076
Junjiao Li,Jun Xie,Dongchen Li,Lei Yu,Chaowei Xu,Senlin Yan,Yuzheng Lu
Interface engineering can be used to tune the properties of heterostructure materials at an atomic level, yielding exceptional final physical properties. In this work, we synthesized a heterostructure of a p-type semiconductor (NiO) and an n-type semiconductor (CeO2) for solid oxide fuel cell electrolytes. The CeO2-NiO heterostructure exhibited high ionic conductivity of 0.2 S cm−1at 530 °C, which was further improved to 0.29 S cm−1by the introduction of Na+ions. When it was applied in the fuel cell, an excellent power density of 571 mW cm−1was obtained, indicating that the CeO2-NiO heterostructure can provide favorable electrolyte functionality. The prepared CeO2-NiO heterostructures possessed both proton and oxygen ionic conductivities, with oxygen ionic conductivity dominating the fuel cell reaction. Further investigations in terms of electrical conductivity and electrode polarization, a proton and oxygen ionic co-conducting mechanism, and a mechanism for blocking electron transport showed that the reconstruction of the energy band at the interfaces was responsible for the enhanced ionic conductivity and cell power output. This work presents a new methodology and scientific understanding of semiconductor-based heterostructures for advanced ceramic fuel cells.
研究领域:
材料科学
·
能源技术
·
电化学
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Hao Lou,Baixi Xia,Chuangang Yao,Haixia Zhang,Zhe Zhang,Yuxi Sun,Jingyi Ding,Li Zhang,Xiaoshi Lang,Kedi Cai
Advancing solid oxide fuel cells (SOFCs) significantly relies on the development of cathode materials that exhibit both high performance and stability. This study introduces a novel heterostructure composite cathode by combining La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3- δ (LSCF) particles with Ce 0.8 Pr 0.2 O 1.9 (CPO) nanosheets through hydrothermal synthesis. The LSCF-CPO composite demonstrates remarkable enhancements in both catalytic activity and CO 2 resistance. The distinctive nanosheet morphology of CPO and the extensive heterointerfaces facilitate superior charge transfer and accelerate the processes of oxygen adsorption and dissociation. The incorporation of CPO nanosheets reduces the thermal expansion of LSCF and alters the oxygen ion transport properties, thereby establishing a three-dimensional network for enhanced ion conduction. At 750 °C, the single cell using the LSCF-10CPO cathode achieves a remarkable peak power density of 1179 mW cm −2 , representing a notable 48 % enhancement over the single-phase LSCF. Additionally, the LSCF-10CPO exhibits exceptional CO 2 tolerance. This research offers valuable insights into the design of next-generation SOFC cathodes with enhanced performance and stability, paving the way for future advancements in energy technology.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Wei Zhang,Jialu Wei,Jiafeng Zhu,Chunwen Sun
Due to its abundant resources and advantages in transportation and storage, methane fueled solid oxide fuel cells (SOFCs) are highly needed. In this work, an exceptional internal reforming catalyst comprising in-situ exsolved NiRu bimetallic nanoparticles and oxygen-deficient layered double perovskite LaBaMn 1.6 Ni 0.3 Ru 0.1 O 5+δ (r-LBMNR) was prepared. Compared to the cell with LaBaMn 1.6 Ni 0.4 O 5+δ (r-LBMN) catalyst, the cell with a Ru-doping r-LBMNR catalyst layer, exhibits superior peak power output of 336 mW cm −2 and better durability with a less decay rate of 0.014% per hour in CH 4 fuel. The enhanced electrochemical performance can be attributed to the high oxygen ion and electron conductivities of the catalyst and the coupling of Ni and Ru sites with the oxygen-deficient r-LBMNR matrix This coupling activates CH 4 and H 2 O, promotes the oxidation of C atoms in CH 4 molecules, and enables reversible hydrogen spillover, ultimately leading to the production syngas of CO(g) and H 2 (g).
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 1
·152
·
IF 2.7
Caixia Shi,Ting Chen,Dongyang Fang,Shaorong Wang
In this work, La1−xSrxNi0.4Fe0.6O3-δ(0 ≤ x ≤ 0.2) oxides were synthesized and employed as the identical electrode of direct methane symmetrical solid oxide fuel cell (SSOFC). In addition, the phase structure, redox stability, electrical conductivity, chemical compatibility, and thermal expansion of La1−xSrxNi0.4Fe0.6O3-δoxides were evaluated. The La2NiO4phase occurs when the amount of doped Sr rises to 0.2. The composition of La0.9Sr0.1Ni0.4Fe0.6O3-δ(LSNF9146) boasts the highest conductivity of 463 S cm−1with lowest activation energy of 0.066 eV as well as a relatively large thermal expansion coefficient. After treatment in methane for 10 h, the LSNF9146 oxide exhibits 33% lower carbon deposition than the LaNi0.4Fe0.6O3-δ(LNF46) oxide. Moreover, the impregnated LSNF9146 electrode demonstrates lower polarization resistance in both air and methane atmospheres. SSOFCs with impregnated LSNF9146 and LNF46 identical composite electrodes have the maximum power densities of 233 and 170 mW cm−2at 850 °C in methane, respectively. These results prove that LSNF9146 is a promising symmetrical electrode with high catalytic activity, good redox stability, and coking resistance to direct methane SSOFCs.
研究领域:
材料科学
·
能源科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Mengke Yuan,Zhe Wang,Juntao Gao,Hongru Hao,Zhe Lv,Xiutao Lou,Lingling Xu,Jingwei Li,Bo Wei
The cathodes of solid oxide fuel cells (SOFCs) often suffer from detrimental cation segregations and associated impurities poisoning, leading to insufficient electroactivity and poor stability. Here we developed a medium-entropy double perovskite GdBa(Co 1.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 5-δ (ME-GBCO) for promising SOFC cathode. The increased configuration entropy can effectively tailor the surface composition with in situ formed active BaCoO 3-δ (BCO) species, rather than inert and deleterious BaO x segregation on parent GdBaCo 2 O 5-δ (GBCO) surface. Accordingly, the layered ME-GBCO cathode with beneficial surface reconstruction exhibited not only high oxygen reduction activity but excellent durability against CO 2 impurity, enabling it a very attractive cathode for intermediate temperature SOFCs (IT-SOFCs). Our study provides a new idea for development of efficient and durable cathodes via configurational entropy induced rational surface reconstruction.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaodan Yu,Rongzheng Ren,Chunming Xu,Jinshuo Qiao,Wang Sun,Kening Sun,Zhenhua Wang
The cathode of a solid oxide fuel cell (SOFC) must exhibit both high activity and robust durability for effective utilization in electrochemical oxygen reduction reaction (ORR). To address this challenge, we present a novel strain engineering strategy that involves the creation of nanoscale local lattice strain microdomains to further enhance the ORR kinetics. Specifically, Ga cations are introduced into some of the B-sites of the perovskite Pr 0.4 Sr 0.6 Fe 0.5 Co 0.5 O 3-δ (PSFC). Benefiting from local lattice strain engineering, the bulk oxygen migration coefficient of the locally strained PSFC sample is significantly enhanced, reaching twice that of the pure PSFC sample at 650 °C. Moreover, the polarization impedance of PSFC (0.102 Ω·cm 2 ) is more than twice that of Pr 0.4 Sr 0.6 Fe 0.4 Co 0.5 Ga 0.1 O 3-δ (PSFCG, 0.043 Ω·cm 2 ) at 800 °C. Microscopic structural analyses and computational calculations indicate that the optimized electronic structure of the rich micro-strain catalyst reduces the bond energy of adjacent B-O bonds and the oxygen transport barrier. This work demonstrates a practical local lattice micro-strain engineering strategy and provides a new approach for improving the performance of ORR electrocatalysts.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Advances
·
2023
·Vol. 4
·期 13
·2839-2852
·
IF 5
Yuan Gao,Mengxi Zhong,Jianpeng Chen,Shouqi Wang,Binyi Zhang,Qingzhuo Li,Wei Liu,Jiu-Tao Gao,Cheng-Xin Li,Chang-Jiu Li
Low-temperature solid oxide fuel cells (LT-SOFCs), which can operate at 600 °C or lower, have recently emerged as a promising technology for widespread applications because of their low cost and high stabilities. Novel electrolyte materials with excellent ionic conductivities and stabilities are increasingly in demand for application in LT-SOFCs. Herein, a dysprosium and zirconium co-doped face-centered cubic phase-stabilized bismuth oxide (DZSB) electrolyte has been synthesized using the reverse co-precipitation method. Dysprosium and zirconium are selected to co-dope bismuth oxide because of their large radii and high polarizabilities, which can enhance conductivity stabilities. Dysprosium and zirconium can uniformly replace Bi sites and single-cubic phase DZSB powders of ∼150nm can be synthesized at 700 °C. High relative densities of sintered DZSB pellets (>95%) are obtained via calculations and scanning electron microscopy. D15Z5SB, which contains 15 mol% dysprosium and 5 mol% zirconium, presents the highest ionic conductivity of 0.037 S cm−1 at 500 °C. The activation energy of the ionic conductivity of D2Z5SB shows a single value of 1.23 eV at high- and low-temperature regions. D20Z5SB and D25Z5SB show excellent stabilities for 450 h at 500 °C, with conductivities of 0.007 and 0.0026 S cm−1, respectively.
研究领域:
材料科学
·
电化学
·
能源材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Silin Li,Hengyong Tu,Lijun Yu,Muhammad Tuoqeer Anwar
Nd 2 NiO 4+δ (NNO)-Ce 0.8 Gd 0.2 O 2−δ (CGO) composites were investigated as cathodes for intermediate temperature solid oxide fuel cells (IT-SOFCs). Planar NiO-YSZ anode-supported cells in size of 50 mm × 50 mm were fabricated with YSZ as the electrolyte. The effects of sintering temperature and the relative proportions of NNO and CGO on the cell performance were investigated in combination with chemical reactivity tests of NNO-YSZ and NNO-CGO. NNO-CGO composite cathodes were successfully sintered on YSZ electrolyte at 1000 °C. By using La 0.6 Sr 0.4 CoO 3−δ (LSC) as current collector, the cell with 70NNO-30CGO composite cathode sintered at 1000 °C exhibited the highest power density of 620 mW cm −2 (at 0.7 V) and the lowest polarization resistance of 0.302 Ω cm 2 at 800 °C. Short-term durability studies revealed that the degradation of cell performance was attributed to the crack formation on the LSC current collector layer and the delamination between NNO-CGO cathode layer and LSC current collector layer.
研究领域:
材料科学
·
能源工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhiying Han,Jinghe Bai,Xu Chen,Xiaofei Zhu,Defeng Zhou
The cobalt-free cathode materials with high activity is critical to the commercial application of medium temperature solid oxide fuel cells (IT-SOFC). Herein, a series of cobalt-free Nb-doped Pr 2 Ni 1- x Nb x O 4 ( x = 0, 0.05, 0.10, and 0.15) perovskite oxides were successfully prepared, and the effects of Nb-doping on the structure, thermal stability and electrochemical properties of the cathode material are studied in detail. The Pr 2 Ni 1- x Nb x O 4 exhibits a K 2 NiF 4 type structure with Fmmm space group. The Nb 5+ cations that doped into Pr 2 NiO 4 replaces the Ni site, which increases the surface oxygen content, then effectively eliminates the phase transition of Pr 2 NiO 4 and significantly improves the ORR catalytic activity . The Pr 2 Ni 0.9 Nb 0.1 O 4 was found to occupy the lowest polarization resistance of 0.057 Ω cm 2 , and the peak power density of single cells supported by the electrolyte is 0.576 W cm −2 at 700 °C, which has good long-term stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Fangyong Yu,Tingting Han,Yishang Wang,Yujiao Xie,Jinjin Zhang,Haibin Sun,Jie Xiao,Naitao Yang
As a new way of power generation , direct carbon solid oxide fuel cells (DC-SOFCs) exhibit great potential in solution of energy crisis and environmental pollution. According to the working principle, the cell operation is a kinetically controlled process, and the reverse Boudouard reaction is the rate-determining step of the whole system. In this study, a Sr-based catalyst is successfully introduced to accelerate carbon gasification and thus enhance cell performance of DC-SOFCs. The electrochemical performance of DC-SOFCs operated on coconut active charcoal with various Sr loading contents (3 wt%–10 wt%), are studied and compared with that of DC-SOFCs with traditional Fe-catalyzed carbon fuel. Experimental results demonstrate that the best output of 316 mW cm −2 is achieved from the single cell powered with 5 wt% Sr-loaded coconut active charcoal at 850 °C, higher than those of DC-SOFCs fueled by pure and 5 wt% Fe-loaded active charcoal. The superiority of the Sr-based catalyst is also demonstrated by the operation stability of the corresponding DC-SOFC, which displays a relatively long operation time of 22.68 h at 0.25 A cm −2 with the fuel utilization of 18.3%. The SEM/EDX results indicate that the Sr-based catalyst exhibits good stability without agglomeration during cell operation at high temperature. In addition, the carbon gasification mechanism catalyzed by Sr-based catalyst is also proposed on the basis of these properties. This study indicates that the designed Sr-loaded coconut active charcoal is expected to be an alternative carbon fuel for DC-SOFCs.
研究领域:
能源科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 36
·18778-18791
·
IF 11.301
Jingwei Li,Zhaoming Fu,Bo Wei,Chaoxiang Su,Xing Yue,Zhe Lü
Some perovskite ferrites suffer from phase decomposition in a reducing environment, and incorporation of high-valence cations, such as Nb5+ and Ti4+/3+, is an effective method to stabilize the ferrites. Herein, we rationally introduce pentavalent tantalum on the B-site of La0.8Sr0.2FeO3−δ (LSF) to prepare novel perovskites La0.8Sr0.2Fe0.95Ta0.05O3−δ (LSFTa05) and La0.8Sr0.2Fe0.9Ta0.1O3−δ (LSFTa10), and evaluate their electrochemical performance as SOFC anodes. The structural stability of LSF is notably improved but the oxygen vacancy content is decreased after Ta doping. LSFTa05 is the most promising anode among the three candidates due to its best performance after 50 h of operation (441.7 mW cm−2 at 800 °C in wet H2) and considerable coking and sulfur resistance. Finally, DFT calculations are performed to study the mechanisms of stability and conductivity of the ferrites with different Ta contents. Our work highlights that LSFTa05 is a high-performance and robust alternative perovskite anode, and could provide valuable insights into developing high-valence cation-stabilized perovskite anodes for SOFCs.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Zhenwei Wang,Haibin Sun,Jiao Li,Xue Guo,Qiangqiang Hu,Zanzhong Yang,Fangyong Yu,Guochang Li
Aiming to lower the activation energy and expedite the oxygen reduction reaction (ORR) process of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-δ (LSCF) cathodes for application in intermediate-temperature solid oxide fuel cells (IT-SOFCs), Er 0.4 Bi 1.6 O 3 (ESB) modified LSCF was prepared by infiltrating using organic solvents . The infiltration of ESB dramatically reduces the polarization resistances of LSCF cathodes (from 0.27 to 0.11 Ω cm 2 at 700 °C, from 0.58 to 0.25 Ω cm 2 at 650 °C), and lowers their activation energy (from 100.28 to 97.15 kJ mol −1 ). Also, ESB makes the rate-limiting step of LSCF cathodes at high frequency change from the charge transfer process on the cathode to the adsorption and diffusion of oxygen on cathode surface . The single cell with ESB infiltrated LSCF cathodes shows a peak power density of 469 mW cm −2 at 700 °C using humid hydrogen and air as fuels and oxidants, respectively, as well as a good short-term stability for 50 h.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）